<div class="dropdown">
	<div>Main Menu</div>
	<div class="dropdown-menu">
		<ul>
			<li><a href="#">Home</a></li>
		</ul>
	</div>
</div>
<style>
.dropdown{
	display:inline-block;
	position:relative;
}
.dropdown-menu{
	display:none;
	position:absolute;
	left:0;
	top:2.1em;
	min-width:100%;
	background-color:#eee;
}
.dropdown:hover .dropdown-menu{
	display:block;
}
</style>